<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../react18/react.development.js"></script>
    <script src="../react18/react-dom.development.js"></script>
    <script src="../react18/babel.min.js"></script>
    <script src="../react18/prop-types.js"></script>
</head>
<body>
    <div id="app"></div>
    <script type="text/babel">
      class Parent extends React.Component{
        render(){
            return (
                <div>
                    <input type="text" ref={c=>this.iptEle =c}/>
                    <button onClick={this.handle}>点我弹出用户的输入内容</button>

                </div>
            )
        }
        handle = ()=>{
            const{value}=this.iptEle
            alert(value)
        }
      }
      const root = ReactDOM.createRoot(document.getElementById('app'));
      root.render(<Parent/>)
    </script>

</body>
</html>